| 摘要 |
A printed circuit board includes a first insulating layer, a second insulating layer on the first insulating layer, and at least one via formed through the first and second insulating layers in a layered structure. The via includes a first via layer formed through the first insulating layer, a second via layer formed on the first via layer while passing through the second insulating layer, and an adhesive layer between the first and second via layers. The first via layer has a section different from a section of the second via layer. The adhesive property between the copper layer and the insulating layer is improved. The vias used to connect interlayer circuits to each other are formed between a plurality of insulating layers through an etching process instead of a laser process or a polishing process, thereby improving the process ability and reducing the manufacturing cost. |
